Question

A ray of light from a liquid (m = $\sqrt { 3 }$ ) is incident on a system of two right angled prism of refractive indices$\sqrt { 3 }$ and $\sqrt { 2 }$ as shown. The ray suffers zero deviation when emerges into air from CD. The angle of incidence i is –

• A. 45⁰
• B. 35⁰
• C. 20⁰
• D. 10⁰

Answer 1

Answer: (A)

45⁰

Answer 2

By Snell's law at the surface AC

$\sqrt { 3 }$ sin = $\sqrt { 2 }$ sin r …. (1)

By Snell's law at the surface DC,

$\sqrt { 2 }$ sin $\left( \frac { \pi } { 2 } - r \right)$ = 1 sin i ……. (2)